Thread-controller for sewing-machines.



mann s'rarnjs earner ormoni.

BUssnL e. woonwann, or wannnean, rumors, assreirn 'ro UNION SPECIAL MACHINE conranr, or cmcaeo, rtmnozsg'a coaron'arron oF rLLINors.

THREAID-CNTRGLLER FOB SEWING-MACHINES,

Specification of Letters Iietent.

Patented Apr. 20, 1915.

appagante mea nay 1i, 190s. semi No. esaooa.

T0 all whom it may concern a citizen of the United States, residing at- VVaukegan, in the countyof Lake, State .of Illinois, have invented certain new and use fnl Improvements in Thread-Controllers -for Sewing-Machines, of which the following is a description, reference being had `to the accompanying drawing and to the letters and figures of reference marked thereon.

VMy invention relates to new and .useful improvements in overseaming machines, and more especially to the three thread type, that is, a 'machine in Which a needle coperates with a 'threaded looper beneath. the Work support, which in turn coperates with a second threaded looper, which carries its thread over the Work support 'into a position for the needle to enter into a 'loop formed therein. It will be oovions however, that' from certain aspects of my' invention, parts thereof at least are useful in'conneo tion With other types of machines, and also useful in connection with other elements of the stitch forming mechanism of the present type of machine.

-T he object of my invention is to provide an overseaming machine wherein "a verytight overseam may be made. n' making what is known in the trade as a pocket or in finishing the edge of the tongue of a shoe and in common Work of a similar character, it'is founddesirablc to make an overseam which shall cover very tightly the edge of the article being stitched.

In carrying outmy invention, l have .provided a controller for. the needle thread which is so arranged as to pull up the slack in the needle thread on the first part of the down stroke of the needle, and to release the needle thread as the needle point' is entering the fabric. 'i

l have also further provided meansv lfor imlling oflthread for the thread carrying loopcr codperating with the needle beneath the work support, which pull off also aids in drawing tight the overseaming stitch.'

My invention consists in the parts arrangements and improvements hereinafter described and set forth in the appended.

claims.

ln the drawings which shan7 by Way of tion; Figure 1 is a side view of a sewing machine With my improvements applied thereto, and with the cover plate removed sofas to show certain parts of the stitch forming mechanism. Fig. 2 is a sectional View 'through the overhangingarm, and the needle lever, showing the controller for the needle thread in side elevation. Fig. 3 is a detail view showing the needle thread controller at the point where the needle thread is released. Fig. 4 is a detail in side elevation of one of the thread carrying loopers. Fig. 5 is a back view of the same. Fig. 6 is a detail 'showing one position of the needle and loopers. Fig. 7 is a' similar vieW showing the extreme lrear position of the loopers.

' n'the present embodiment of my invenltion, the bed plate 1, has rising therefrom, an overhangin arm 2, carrying a needle bar 3 at the forward end thereof. Said needle bar is provided with a needle 4, and receives its oscillation from a needle lever 5, pivoted at 6 to the overhanging arm. Said needle lever 5 is connected in the usual way tothe needle bar by means of a link 7. The needle lev'er 5 is oscillated by means of a. link 8,'Which coperates'wit'h an eccentric on the main shaftlt which is rotated 'by the usual beit Wheel 1Q. .The needle thread passes from the supply Ato a thread guiding arm 11 to an eyelet 12 and thence, to a tension device 13- carried by the head of the machine. The thread is then led through an eyelet 14, carried by the needlelever 5, and to'a tension 'device 15,'carried by the overhanging arm. It will be 'seen,`that as the needle lever is vihra'ted the thread eyelet'14`carried thereby, will engage the thread ybetvireen the ten` sion devicesl andr 15, and pull' a little thread each time, through the tension device 13. 'The thread after vleaving the tension,

device 15, passes through my improved thread controller 16, to an eyelet 17 ,which is adjustably secured to the ovrhanging arm of the machine. Said eyelet '17 is carried by "a plate 1'8, which is slotted at 19 to receive the 'guide pin 20, and a locking screw 21.

The'thread passes from the' eyelet 17 through the tension device 22, carried by the' needle bar 5, and thence to the eye of the needle.

Myimproved thread 'controller 16 com prises tivo thread guides 23,24, carried by a plate secured to the overhangmg arm- The needle lever 5 carries a base plate 26 to which is adjustably secured a bracket 27, carrying arms 28 and 29. Said arms 28 and 29 are formed with the thread engaging shoulder 30 near the upper end.' Said arms above the thread engaging shoulders are tapered as at 31,'Fi'g. 2, so as to readily pass the thread in their upward movement. A thread releasing cam 32 is carried by the overhanging arm, and lies in the space between the thread arms 2S and 29. The operation of my thread controller will be obvious.Y When the needle lever 5 is vibrated so as to cause the needle to descend, the arms 2S and 29 are brought down with the needle lever. The thread engaging shoulder 30 is brought into engagement With the needle thread passing through the thread guides 23 and 24 and carries the thread downward therewith as shown in\Fig. 3. As soon as the thread is carried down by the arms 28 and 29, it is brought into engagement' with the releasing cam 32, which crowds the thread off from the thread engaging shoulder 30, thus releasing the thread from the arms 28 and 29. By adjusting the position of the bracket 27, which supports the thread arms 28 and 29, I may thereby vary the time when the thread will be released, and also the amount of thread taken up by said arms.

It will be noted that the arms 2S and 29 lie in the arc' of a circle, the center of which is the pivot pin 6 for the needle lever 5.

It will also be noted that the cam 32 is similarly curved.

Coperating with the needle beneath the work support 33, is a thread carrying looper 34, which is mounted on a looper carrier 35, pivoted at36-to the bed plate. Said looper carrier 35 is vibrated by means of a link .37, which is connected to one arm of a lrock shaft'38, pivoted to the standard of the ma chine. Said rock shaft 38 is connected .by means of a link 39 to an extension 40 carried by the needle level' 5. These parts are of the usual construction in this type of overseaming machine, and will not need further description. As the needle is reciprocated the thread carrying looper 34 Vmoves forward into the needle loop, and moves to the position shown in Fig. 1. A-

thread carrying looper 41 is carried by a suitable support beneath the work support and isv-vibrated by mechanism connected to the main shaft in the usual manner in this type Hof machine. y Said thread carrying looper moves up between the thread running from` the previous stitch to the eye of the thread carrying looper 34, and the body thereof. Said looper 4l continues up over the work support to a position Where the needle may enter the loop of thread formed by the looper 41. The thread for the looper 41 passes from the supply through a thread guide 42, and thence, to an eye 43 carried by the needle lever extension and moving therewith, so as to pull thread from the supply for said looper. The thread then passes through a tension device 44 and then to an adjustable eyelet 45, carried by the standard of the machine. Said thread is then led through an eyelet 4G carried by the needle lever extension, and moving therewith, and which serves as a take up for the thread of the looper 4l. The thread passes from the eyelet 4G to a stationary eyelet on the bed plate and then through the open eye 47 at the heel of the looper 41 to the eye of the looper. The thread for the looper 34 passes from the supply through a suitable guide 48 to the eyelet 49 carried by the needle lever extension 40, which serves as a means for pulling thread from the supply for said looper. The thread then passes through the tension device 50,- and is thence, led to a stationary thread guide 51, and from said thread guide to the eye at the heel of the looper 34, and thence, to the eye of said looper.

The thread guide 51 as shown in Figs. 6 and 7 is so located that the thread passing from said thread guide to the heel of the looper lies in the path of movement of a lug projecting from the body of the looper 41. Said lug in the present embodiment of my invention is shown as a shank of the open eye 47, although it is obvious that said lug may be entirely independent of this thread eye.

The operation of my device is as follows z-Vhen the needlel is substantially at its eXtreme upper position, the thread carrying looper 34 is substantially at its extremeforward position, and the needle loop llG needle descends, the thread arms 28 fand 29 engage the needle thread, and drawing thereon, pull up the needle' threadfthat' is given up by the backward movement of the looper 34, thus drawing some of the slack out of the previously formed stitch. Said f thread arms 28 and 29, also at vtliisatime draw a little thread through the tension device 15. .As soon as the .eye of the Aneedle however, nearly reaches the upper surface ofthe Work, the thread is released from said thread armsf28 and 29 by the vreleasing cam 32. This leaves-the needle as the eye' thereL of is aboutfltoenter the fabric with the thread thereof/entirely slack,so-'that said n eedle eye may pass well ric before said slack is taken up.

After, however, the` needle has passed well 'through'.

thfeugh ai@ ab- Y rproved thread controller, the necessary slack 'the fabric, said slack is consumed and the previous stitch still further tightened 'ley the needle.

I have found in practice that in order to put suilicient tension on the thread in an overseaming machine, so as to make a tight stitch, I must avoid putting strain on the thread at the time the eye of the needle is passing through the' material. When the eye of the needle is passing through the rnaterial, the thread is pnt under considerable strain, and if there is any rearing of the thread through the eye Iat this time, seid thread will be broken. li the thread is taut at the time the eye of the needle reaches the material, this reaving of the thread therethrough occurs. After the eye of the lneedle is entirely through the material, the

thread then lies in the groove of the needle, and the binding action of the material on the thread, is released to a certain extent, so that no harm is caused by the thread sliding through the needle eye. By my im- 1s given to the thread at the proper time, so that said thread is entirely free from tension, when the needle eye is paing through the material and l can thereby, greatly increase the tension on the' needle V4` `*11.355*thread. As the looper el is retracted, it en.

gages the louper thread of the lo'oper 3l just be ore the loop of said looper 3e is shed from the looper 41, and takes up Vthe slack caused therein, and a further retractin movement of the looper #l1 causes the stitcn to be drawn tight and causes a certain amount to he pulled thrngh the tension 50 for said vlooper 34. This thread drawn 'oil by the looper 4:1,is given up to the looper 34, as it moves forward intothe needle loop.`

The purpose of drawing from the supply a little thread for the looper 3e, which is' given up to the louper as it moves forward, is so that the needle loops when the stitch is set, will lie in a line coincident with the needle punctures. lf the looner thread is slack, the tension on the needle thread will draw the needle loops into the line of the needle punctures, and thus produce a, very tight stitch.

I have shown the bracket 2'? connected to the hase plate 26 hy means oi a screw 27a and a slot 27, l have also shown, see Fig.

amount of threadpulled o5. the bracket 27 thread vCarr in f loo er and with the neerll Ancath the worlr support, a sec is adjusted hy loosening the screw 2 f and after this is set so as to release the threadat the proper time, then the thread guides and 24:, may he adjusted so that the amount of thread pulled oil, will remain the seine.

Having thus particularly described my in! T"entren, what l. claim as newY and desire secure by Letters Patent, is:

l. The combination with stitch rorming mechanism, including a needle, of means or the downward movement of the rie-:dl and for gri-'ing slack to said needle the eye thereof enters the material and indre pendent means for taking up the needl,

thread' for setting the stitch.

2. The combination with stitch forming mechanism, including a needle, a tension,

means for taking up `the needle thread on4 the first 'part of the downward .movement of the needle, pulling thread' through the terr 'sion and giving slack to the ,needle as the eye thereof enters the material independent means for taking up the needle thread for settingfthe stitch.

3. ln an overseancinf/w machine, the com@ hination of a needle and complemental rming mechanism `for carrying thread around the edge of the material ano' a needle thread controller operating to pall 11i-ostile needle thread on the rst part of the downward movement of the needle and to gire up slack to the needle just before the eye thereot` enters the material.

l. ln an over-seeming machine, the nation of a work support, a needle, carryingl looper coperating ther-enit 1 he nea-th the work support, a second 'thread earrying looper coperating with the ilf'f't above the Wol-lr support, a needle thread ccnl troller operating to give slack to the needle justhefore the eye thereof the terialand means independent ot sicl: thread controller for taking up the needle thread for setting the stitch.

Y ln an ovcrseaming machine.. the combination'of a Work support, a needle. a thread carrying looper cooperating therewith becarrying looper cooperating wirr the thread'carrying looper and with the needle above the Work support, and )sedie three "l controller operating to pull up the needle thread on the first part of the downwar* increment el the needle, and to gire up slack for taking up the needle thread on the first nari.,

you

to the needle -just before the eye thereof *i enters the material.

- 6i. ln an orerseaming machine, the conhination with a Work support, a needle, a thread carrying looper cooperating with said needle beneath the .vorlrvenppert, a

second thread carrying loog-ier cooperating-r with the rst thread carrying looper and with the needle ancre the Werl: support and a needle thread controller for taking up the "..fslack lin the needle thread on the downward stroke of the needle and releasing the same just before the needle eye enters the material, said needle thread controller including a reciprocating thread engaging member and means coperating therewith to release i the thread from said member.

7. The combination with stitch forming .mechanism, including' a needle, of means for taking up the slack in the needle thread, and releasing the same just before the needle eye enters the material, including spaced thread guides, a reciprocating arm intermediate said thread guides having a thread engaging shoulder, and a. releasing cam for stripping the thread from said shoulder.

8. The' combination with stitch forming mechanismincluding a needle, a needle lever for reciprocating the same, a, thread arm carried by said needle lever and having a thread engaging shoulder, spaced thread guides between which said arm is reciprocated, Vand means for releasing'the thread from said shoulder. h

9. The combination with stitch forming mechanism including a tension device, a

membeig means for oscillating the'same, a

thread engaging arm carried by said oscillating member and projecting laterally i therefrom, said ,thread engaging arm being curved so as to lie in the arc of a circle, the center of which is the pivotal point of the oscillating` member, a stationary member eX- tending at right angles to the plane of movement of said oscillating., member and disposed so as to coperat with said threadr en-' gaging arm for stripping the thread from said arm, and thread guides for guiding the thread so as to be yengaged by said thread engaging arm as the same oscillates.

11. T he combination with an oscillating member, means for oscillating the same, a

- thread engaging'arm carried by said oscillating member and projecting laterally therefrom, said thread engaging arm being curved so as to lie in the arc of a circle,

the center of which is the pivotal point of f the oscillatinglmember, a stationary member curved to correspond to saidcurved arm and having a laterally projecting cam for stripping the thread from said arm, and

.thread guides for guiding the thread so that 'the same is engaged by said arm during the oscillations thereof.

- 12, The combination of a member, means for oscillating the same, a bracket carried movement of the oscillating member for positioning the thread in engagement with said thread engaging shoulders.

13. The combination of an oscillating member, means for oscillating the same, an adjustable bracket carried by said member, parallel spaced thread arms carried bysaid bracket, each of which is provided with a thread engaging shoulder, said'arms being curved about the cent/er of said oscillating member, a stationary thread cam located between the thread arms and operating to release the thread from the thread engaging shoulder, and spaced thread guides coperating therewith. 1'4. In an q verseaming machine, the combination ofi a needle, and complemental stitch' forming mechanism for carrying threads around the edge of the material,

'and a needle thread controller operating to give slack to the needle, just before the eye thereof entersl the material, said needle thread controller including a reciprocating thread engaging arm, spaced thread guides cooperating therewith, and means for re.

leasing the thread from said arm.

15. ln an overseaming machine, the com.

bination of a needle, and complemental stitch forming mechanism for carrying needle above the work support, and a needleA thread controller operating to give slack to the needle just before the eye thereof enters the material, said needle thread controller including a reciprocating thread engaging arm, spaced thread guides coperating therewith, and means for releasing the thread from said arm.

17. In an overseaming machine, the combination of a work support, a negdle, a

thread carrying looper coperating therewith beneath the work support, a second thread carrying looper coperating with the first thread carrying looper, and with the i needle above the work support, and a needle thread controller operating to gire slack to the needle just before the eye thereof enters the material, said thread controller including spaced thread guides, spaced thread engaging arms and a cani plate located between said thread arms and stripping the thread from said arms.

18. In an 'overseaniing machine7 the coini bination of a worksupporh a needle, a ten sion device fol-*the needle thread, a thread carrying louper coperating therewith be?" carrying looper coperating therewith be' neath the Work support, a second thread carrying loopt? coperating with the rst thread carrying looper, and with the needle above the Work support, and a needle thread controller operating' upon the needle thread between' the tension and the needle, and adapted to give slack to the needle just be "fore the eye thereof enters the material,

said needle thread controller including spaced thread guides, a thread arm for engaging the thread between said thread guides, and means 'for stripping the thread from said thread arin.

20. ln anorerseaming machine, combina-v vthe tension device and the looper for pulling thread through said tension device, said means including a thread engaging arm carried by the thread manipulating device.

'21. An overseaining machine including in combination a work support, a needle, a thread-carrying locper cooperating therewith beneath the Work support, a second` thread carrying looper cooper-ating with the first thread carrying looper and with the needle above the work support, a thread controller operating to pull np the needle thread on the iirst part of the down stroke of the needle, and to give slack to the needle as the eye thereof enters the material, and means voperating upon the loopcr thread of the looper copcrating with the nleedle be-y neath the work support, to take up the Looper thread and to pull thread' from the supply, tension devices for the needle and for the looper threer e,

ln testimony whereof l rny signature, in presence of two witnesses.

Witnesses:

Unseren Meli-rim., D. S. SEYMOUR. 

